From The Telegraph:
A British man may have fathered 600 children by repeatedly using his own sperm in a fertility clinic he ran, it has emerged.
Bertold Wiesner and his wife Mary Barton founded a fertility clinic in London in the 1940s and helped women conceive 1,500 babies.
It was thought that the clinic used a small number of highly intelligent friends as sperm donors but it has now emerged that around 600 of the babies were conceived using sperm from Mr Wiesner himself.
Life would be a whole lot better if people just followed the teachings of the Church.
From the CDF:
…fertilization of a married woman with the sperm of a donor different from her husband and fertilization with the husband’s sperm of an ovum not coming from his wife are morally illicit. Furthermore, the artificial fertilization of a woman who is unmarried or a widow, whoever the donor may be, cannot be morally justified.
[RIGHT]Instruction on respect for human life in its origin and on the dignity of procreation – Donum vitae[/RIGHT]
(You can read the rest of this detailed document, published by Cardinal Ratzinger in 1987, for the full rationale why the above conclusion was reached)